ʿAhed ʿid 49fa03bf42 Allow using custom time format (#798)
* Allow using custom time format

I need to use custom time format in `conf/app.ini' like 

    FORMAT = 2006-01-02 15:04:05

so that Gitea will display '2017-01-30 08:41:49'
check this answer for more constants to format date  <http://stackoverflow.com/a/20234207/2570425> 

PS: First GO commit

* Refactor and validate TimeFormat (must have 2006, 01, 02, 15, 04 and 05)
2017-02-04 20:37:50 +08:00
..
2016-11-25 16:37:04 +08:00
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